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Similar to existing MP_NOINLINE.

Skip tests if not available.

Tries to summarize most of the issues we've seen so far.

People tend to skip introductions (everyone knows what esp8266 is, right?),
so try to do A/B testing with a title inviting to read it.

Not all NodeMCU boards require it.

Default is disabled, enabled for unix port. Saves 600 bytes on x86.

This includes file and socket objects, backed by Unix file descriptor.
This improves compatibility with stmhal's uselect (and convenience of
use), though not completely: return value from poll.poll() is still
raw file descriptor.

That apparently will only help folks who read the docs on how to disable,
but could use a quick reminder straight in boot.py. For the developers,
it's important to have debug logging enabled in development branch
(master).

This goes bit against websocket nature (message-based communication),
as it ignores boundaries bertween messages, but may be very practical
to do simple things with websockets.

Name recv() based a "simplistic", as it can't work robustly in every
environment. All this is to let people concentreate on proper, read()-
based one (and to turn recv() based into a "negative showcase",
explaining what are the pitfalls of such approach).

Namely: flags, cachesize, pagesize, minkeypage.

In the sense that while GET_FILE transfers its data, REPL still works.
This is done by requiring client to send 1-byte block before WebREPL
server transfers next block of data.

Requires firmware generated by the latest makeimg.py (which stores size
and md5 of the firmware together with the firmware itself).

md5 is calculated over the entire file, except first 4 bytes, which contain
flash parameters and may be changed by flashing tool or MicroPython flash
auto-config.

This version of the logo may be useful for displaying on small
devices to show that they use MicroPython.

These macros are broken and are anyway unused on these two ports.  If they
are ever needed in the future then their implementation can be taken from
either stmhal (working macros in mpconfigport.h) or esp8266 (functions).